diff --git a/crawlab/routes/deploys.py b/crawlab/routes/deploys.py
index 9cf4bf7c..885173c1 100644
--- a/crawlab/routes/deploys.py
+++ b/crawlab/routes/deploys.py
@@ -11,7 +11,12 @@ class DeployApi(BaseApi):
         ('node_id', str),
     )
 
-    def get(self, id=None, action=None):
+    def get(self, id: str = None, action: str = None) -> (dict, tuple):
+        """
+        GET method of DeployAPI.
+        :param id: deploy_id
+        :param action: action
+        """
         # action by id
         if action is not None:
             if not hasattr(self, action):
diff --git a/crawlab/routes/files.py b/crawlab/routes/files.py
index 4f18f0ee..ef80e20b 100644
--- a/crawlab/routes/files.py
+++ b/crawlab/routes/files.py
@@ -15,6 +15,10 @@ class FileApi(Resource):
         self.parser.add_argument('path', type=str)
 
     def get(self, action=None):
+        """
+        GET method of FileAPI.
+        :param action: action
+        """
         args = self.parser.parse_args()
         path = args.get('path')
 
diff --git a/crawlab/routes/stats.py b/crawlab/routes/stats.py
index f637039f..aa7432c6 100644
--- a/crawlab/routes/stats.py
+++ b/crawlab/routes/stats.py
@@ -8,7 +8,11 @@ from utils import jsonify
 
 
 class StatsApi(Resource):
-    def get(self, action=None):
+    def get(self, action: str = None) -> (dict, tuple):
+        """
+        GET method of StatsApi.
+        :param action: action
+        """
         # action
         if action is not None:
             if not hasattr(self, action):
@@ -23,6 +27,9 @@ class StatsApi(Resource):
             return {}
 
     def get_home_stats(self):
+        """
+        Get stats for home page
+        """
         # overview stats
         task_count = db_manager.count('tasks', {})
         spider_count = db_manager.count('spiders', {})
diff --git a/crawlab/tasks/spider.py b/crawlab/tasks/spider.py
index 681ddab2..589fe9b1 100644
--- a/crawlab/tasks/spider.py
+++ b/crawlab/tasks/spider.py
@@ -2,7 +2,7 @@ import os
 from datetime import datetime
 
 from bson import ObjectId
-from config import PROJECT_DEPLOY_FILE_FOLDER, PROJECT_LOGS_FOLDER,PYTHON_ENV_PATH
+from config import PROJECT_DEPLOY_FILE_FOLDER, PROJECT_LOGS_FOLDER, PYTHON_ENV_PATH
 from constants.task import TaskStatus
 from db.manager import db_manager
 from .celery import celery_app
@@ -12,12 +12,17 @@ from utils.log import other as logger
 
 @celery_app.task(bind=True)
 def execute_spider(self, id: str):
+    """
+    Execute spider task.
+    :param self:
+    :param id: task_id
+    """
     task_id = self.request.id
     hostname = self.request.hostname
     spider = db_manager.get('spiders', id=id)
     command = spider.get('cmd')
     if command.startswith("env"):
-        command = PYTHON_ENV_PATH + command.replace("env","")
+        command = PYTHON_ENV_PATH + command.replace("env", "")
 
     current_working_directory = os.path.join(PROJECT_DEPLOY_FILE_FOLDER, str(spider.get('_id')))
 
diff --git a/crawlab/utils/deploy.py b/crawlab/utils/deploy.py
index f7879a68..e04c7da7 100644
--- a/crawlab/utils/deploy.py
+++ b/crawlab/utils/deploy.py
@@ -1,8 +1,13 @@
 import os, zipfile
 from utils.log import other
 
-# 打包目录为zip文件（未压缩）
+
 def zip_file(source_dir, output_filename):
+    """
+    打包目录为zip文件（未压缩）
+    :param source_dir: source directory
+    :param output_filename: output file name
+    """
     zipf = zipfile.ZipFile(output_filename, 'w')
     pre_len = len(os.path.dirname(source_dir))
     for parent, dirnames, filenames in os.walk(source_dir):
@@ -14,6 +19,11 @@ def zip_file(source_dir, output_filename):
 
 
 def unzip_file(zip_src, dst_dir):
+    """
+    Unzip file
+    :param zip_src: source zip file
+    :param dst_dir: destination directory
+    """
     r = zipfile.is_zipfile(zip_src)
     if r:
         fz = zipfile.ZipFile(zip_src, 'r')
diff --git a/crawlab/utils/file.py b/crawlab/utils/file.py
index cec15ad5..d549c62d 100644
--- a/crawlab/utils/file.py
+++ b/crawlab/utils/file.py
@@ -14,7 +14,12 @@ SUFFIX_LANG_MAPPING = {
 }
 
 
-def get_file_suffix(file_name: str):
+def get_file_suffix(file_name: str) -> (str, None):
+    """
+    Get suffix of a file
+    :param file_name:
+    :return:
+    """
     file_name = file_name.lower()
     m = suffix_regex.search(file_name)
     if m is not None:
@@ -23,7 +28,11 @@ def get_file_suffix(file_name: str):
         return None
 
 
-def get_file_list(path):
+def get_file_list(path: str) -> list:
+    """
+    Get a list of files of given directory path
+    :param path: directory path
+    """
     for root, dirs, file_names in os.walk(path):
         # print(root)  # 当前目录路径
         # print(dirs)  # 当前路径下所有子目录
@@ -35,6 +44,10 @@ def get_file_list(path):
 
 
 def get_file_suffix_stats(path) -> dict:
+    """
+    Get suffix stats of given file
+    :param path: file path
+    """
     stats = defaultdict(int)
     for file_path in get_file_list(path):
         suffix = get_file_suffix(file_path)
@@ -44,6 +57,10 @@ def get_file_suffix_stats(path) -> dict:
 
 
 def get_file_content(path) -> dict:
+    """
+    Get file content
+    :param path: file path
+    """
     with open(path) as f:
         suffix = get_file_suffix(path)
         lang = SUFFIX_LANG_MAPPING.get(suffix)
diff --git a/crawlab/utils/node.py b/crawlab/utils/node.py
index c6cd47be..07a45c01 100644
--- a/crawlab/utils/node.py
+++ b/crawlab/utils/node.py
@@ -8,11 +8,18 @@ from db.manager import db_manager
 
 
 def check_nodes_status():
+    """
+    Update node status from Flower.
+    """
     res = requests.get('%s/workers?status=1' % FLOWER_API_ENDPOINT)
     return json.loads(res.content.decode('utf-8'))
 
 
 def update_nodes_status(refresh=False):
+    """
+    Update all nodes status
+    :param refresh:
+    """
     online_node_ids = []
     url = '%s/workers?status=1' % FLOWER_API_ENDPOINT
     if refresh:
diff --git a/crawlab/utils/spider.py b/crawlab/utils/spider.py
index 61616790..0a45d28f 100644
--- a/crawlab/utils/spider.py
+++ b/crawlab/utils/spider.py
@@ -3,8 +3,10 @@ import os
 from constants.spider import FILE_SUFFIX_LANG_MAPPING, LangType, SUFFIX_IGNORE, SpiderType
 from db.manager import db_manager
 
+
 def get_lang_by_stats(stats: dict) -> LangType:
     """
+    Get programming language provided suffix stats
     :param stats: stats is generated by utils.file.get_file_suffix_stats
     :return:
     """
@@ -20,14 +22,21 @@ def get_lang_by_stats(stats: dict) -> LangType:
         pass
 
 
-
 def get_spider_type(path: str) -> SpiderType:
+    """
+    Get spider type
+    :param path: spider directory path
+    """
     for file_name in os.listdir(path):
         if file_name == 'scrapy.cfg':
             return SpiderType.SCRAPY
 
 
-def get_spider_col_fields(col_name):
+def get_spider_col_fields(col_name: str) -> list:
+    """
+    Get spider collection fields
+    :param col_name: collection name
+    """
     items = db_manager.list(col_name, {}, limit=100, sort_key='_id')
     fields = set()
     for item in items: